Maintenance Instructions - ABB REM 610 Operator's Manual

REM 610 REM 610
5.2.
52
Motor Protection Relay
Operator's Manual - ANSI version
Polarity checking of phase current transformers (CTs) should be
performed to confirm that the wiring circuitry between the CTs and the
relay is correct, which is a prerequisite for the protection functions in
the relay to operate correctly. The circuit breaker tripping circuit,
interlocking and signaling wiring should also be tested.
When commissioning the relay, secondary injection testing is performed to secure
personal safety in case of short circuits or ground faults in the system. If wanted,
secondary injection testing can also be used for more elaborate testing of the relay's
functionality.
Relay commissioning contains:
1. Verifying that the correct application-specific settings have been entered into the
relay. This is done by reading the relay settings either via the HMI or serial
communication and comparing these to the calculated application-specific
settings. If read via serial communication, the settings can be stored as a
commissioning setting record file.
2. Verifying the current measurements – refer to Section 5.3. Measurements
verification
3. Testing of signal routing to output contacts – refer to Section 5.4. Function test
4. Testing of digital input signals availability – refer to Section 5.5. Digital input
test
5. Testing of short-circuit protection – refer to Section 5.6.1. Testing of the short-
circuit protection
6. Testing of ground-fault protection – refer to Section 5.6.2. Testing of the ground-
fault protection

Maintenance instructions

Relay preventive maintenance includes verification of the relay operation and
changing the possibly worn parts. The verification is carried out to ensure that the
relay hardware operates correctly, that is, as it did when first commissioned.
When performing periodic preventive maintenance, the whole circuit breaker
tripping circuit should also be tested, if possible. This can easily be done with the
plug-in unit removed from the relay case, as the terminals for output contacts in the
relay case are left open in such a situation.
When the plug-in unit is removed from the case, internals of the case
must not be touched. Relay case internals may have high voltage
potential and touching these may cause personal injury.
1MRS755538